I would have look to get you the brand name, its out in the shop right now. I can tell you its the case that Armalite sells for their AR-50 50 BMG rifle. 62" length. It would be plenty large for your rifle and not overly spendy either. I think they are around $150 and are aluminum bodied.

Very nice cases for the money.

Strong enough to pack around a 60 lb rifle in as well so the handle will take 80 lbs easy enough.